Radio receiving system



H. D. STALEY RADIO RECEIVING SYSTEM Filed May 1 1, 1926 Oct. 4, 1932.

l9 *IIIIIFIIII INVENTOE HE/VfiD/ILEK Hi5 A7727? Patented b4, 1932 I PAT NT OFFICE nmmv' 1). STALEY, or OAKLAND, CALIFORNIA RADIO RECEIVING SYSTEM Application filed m 11, .1926. Serial No. 103,210.

ii invention relates to; a' system for re-I ceiv'ingradio frequency signals, especially b the aid of electronlc emiss on "devlces, suc

as audions,

' 5 ,f This'lapplicationis a continuation part of a. prior application filed March '4, 1926 in my name, having Serial Number92,l15 and entitled Radio receiving system,

.Itl's one of, the objectsof my invention to make itpossible to receive radio signals with aj's'irnple and inexpensive apparatus. I,have'developed a system byexperimentationQtha-t utilizes butone detector tube, yet

that can obtainaudible signals from distant points; and" it isjtherefore another ob ect of my invention to provide a receiving set utilizing 'a'single tube andhaving a large range.

. Qfcofurse, my invention'can be utilized with 1 a plurality oftubesalso. j; My invention possesses other advantageous features, somev of which Withthe foregoing, willbe set" forth at length inthelfollowing desription,jwhere I shall outlinein full those forms ofmy invention which I have selected 2 for illustration in the drawing accompanyihgand forming part of the present specificationf Although 'I' have shown in the drawing but'a few" embodiments of my 111- vention, I do not'desire to be limited thereto, 36 since'the invention'as definediin theclaims" be embodied in other forms also,

' Referring to the drawing one form of my invention; an

Figure 21 is a wiring diagramof a modified o f f i 1' UT iIn Fig-1 1 I. show a conventional form of absorbing circuit, such asfthe elevated conductors 'or 'antenna 1 1, condenser 12,'leading 40 inductance coil"13,f andl'ground 34; Of (course, other equivalent forms of absorbing circuit ,co'uld be used. Operatively asso ciated with the; circuit, is a conventional type of electronic emlsslon dev ce, or audlon 14, I As is now well understood,- such devices includela plurality"ofelectrodes sealed in a' One of the electrodes, such as"15',ser.ves as" the scatter electronic emission; and for thispurpose it is in filamentary form, whereby current from a source such as battery 16 can be, passed through it to heat it to a degree sufiicient for theemission of electrons. The filament circuit usually includes a variable resistance or rheostat 17, whereby the activity of the filament 15 may be controlled.

A plate electrode 18 serves toreceive the electrons emitted from filament 15, and its ability to draw suchelectrons is increased 1 by impressing a positive potential. on the plate, as by the aid of battery 19, The resultant flow of electrons between the filament l5 ,and plate 18 is termed thespace current. This can be controlled by a third electrode, such as a grid 20, usually'interposed between the, filament 15 andthe plate 18, s'ogas to control the potential of a point in the space between these electrodes. Comparatively minute variations in potential between the filament 15 and grid 20 cause 0017-, 7 respondingly large variations in space cur All this is well understood, and is outlined here merely to make it possible to coordinate. the description of the new features rendered necessary with my invention, with what is known; I When signaling impulses are received, there exists acorresponding'E. M. F. across the terminals, of an element in the absorbso ing circuit, such as of coil 13,,which can i U u p be appropriately connected so as to afiectthe Figure 1 is a schematic wiring diagramof device 14. In the present instance, this is accomplished through'a capacity. The lower end of coil'13 isconnected to filament 15, 5

1 by way of connection 21 and variable condenser 26, the farther side of which may be grounded at 34. The condenser 26 has about .001 microfarad capacity. A unique feature ofmy invention is thatthe control electrode 20, instead of being externally connected 'to theother'ter'minal of coil 13, is instead in electricalconnectionexternally of tube 14;, with thesame terminal as filament 15. This connection is accomplished by way of a high resistance 22, of the order of from 1 to 30 1 megohms, branching a variable condenser-23 of the order of from .00O5 to .001- microfarads. The upper'term'inal ofcoil 13 is connected 7 to the plate 18. The translating device, such I by condenser :26; and the volume or intensity 19, phones 24 (shunted by the usual ile asphones 24, is in a' circuit extending from the plate 18 to filament 15,'which can be traced as follows: from 'plate' 18, batteryv phone condenser ,back to filament 15. 1 Ihav'e found'by experiment that remarkably good results can be obtained. by the receiving system above described. This is also improved by the aid of a conductor 27 in the form of a flat disc or rectangle, ad-

'justable as by pivot28, and connected to ground. This conductor'is' placed adjacent the coil 13 and lies within its magnetic! field so that it provides a means of adjust-- ing the damping of the circuit. With this equipment, I have been able to pick up sigs nals several thousand miles distant, with be high; from'about 8 to 10 megohms; for

local reception, from one quarter megohmgood audibility and comparative freedom from disturbing noises; I f For distant reception, resistance: 22 must up'may be used. -This resistance is preferably variable for that reason.

The tuning of the system is accomplished of the signals by varying the grid resistance.

@ In, Fig. 2 ,lfihave shown 'aslight' modification. -The absorbing circuitin this case includes'a variable condenser 30, connected to the ground'29. Furthermore, the metallic I member 27 isfr'eplaced bya double disc 31 comprising two plates insulated from each other, one connected to ground, and the other 7 between condenser, and coil 18; jin other V words,*'condenser 3O haseach' of its terminals respectively connected to the plates. An-

, Other variation 'is'the'provisionof an air cored choke coil 32in series with condenser of about lOOturns; and lastly, a connection 33 extends from a terminal of phones 24: toa variable point on resistance 22. 'These variations arenot absolutely essential; but

they be useful undercertain' conditions. lni'b'oth modifications, 'I found that 'recepjtioncan be obtained even when the filament 1 5 is dark. I do not 'ffully understand the manner in which the circuit of my invention operates; for the actionstaking place are Equite complex andincapable at the timeof adequate analysis; i i "I claim;

presenti fl. Ina radio receifingsystem, an absorb-j lllg bllcult ncluding an 1mpedance,an elec-V tr'onic emission device: having an electron emitting electrode, a control electrode and a j, plate electrode, said plate electrode being coupled to; one terminalof the impedance,

' other, a' connection between the control elecand the electron emitting electrode to the trode and that terminal of-thefimpedance which is connected to the electron emitting electrode, 's'aidfconnection includingfa cone p v denser and; a high resistance in parallel, a

circuit including a source of electrical energy and a, translating device connecting the plate electrode and the electron emitting electrode,

and a metallic damping member lying within the magnetic field of the impedance and connected toone of itsterminalsr V V 2. In a radio receiving system, an absorbing circuit including inaseries, an inductance coil, a condenser, and agroundconnectiomadetecting device associated with the system,

and apair of spaced, insulated metallic plates adjacent the coil and connected respectively to opposite sides of the condenser.

3. In a radio receiving system, an absorbing circuit including'aninductance coil, an electronic emission device having an electron emitting electrode, a control {electrode and a plate electrode, said plate electrode being coupled to one terminal ofthe" coil, and the electron emitting electrode to the "other', 'a circuit extending between'the plate and the electron emitting electrode 5 including a; source of direct current and a1 translating 7 device, a high resistance connecting the control electrode and the. electron-emittingelectro de,'.an inductance and afcon'denser shunting said resistance, said control electrode be ing externally in connection only by said resistance and shuntpath," and. a. connection extending *from' thatterminal of the trans- 'lating' device which" is farthest fromjthesource, to an tintermediatepoint of said high resistance. 1 'f 4 4. In aradioreceiving system,ian absorbing circuit including a GQll. and a condenser; an electronic emissiondlevice-having an electron emitting, electrode; a control electrode an electronic remission devicexhaving. an electron emittingelec'tro de, acontrolelectrodetand an output electrode the output electrode be ing directlyconnected to thefirst terminal, of the coil; theelectronremitting-zelectrode being c'onnectedlto the second terminal of the coil through the lcondenser;. a connection between the controLele'ctrode and the second terminallof the ceil consisting, essentially of an impedance. which includesone continuous: resistance path; and a circuit including a source of electric energy, and a translating device for connecting'the outputelectrode to the electron emitting electrodes r 6. In a radio receiving system, an absorbing circuit including a coil and a condenser; an electronic emission device having an electron emitting electrode, a control electrode and an output electrode; the output electrode being directly connected to the first terminal of the coil; the electron emitting electrode being connected to the second terminal of the coil through the condenser a connection between the controlelectrode and the second terminal of the coil consisting of a condenser and a coil in series, and a resistance in parallel therewith; a direct connection between theresistance and the electron emitting electrode; and a circuit including a source of electrio energy and a translating device connect ing the plate electrode and the electron emitting electrode. 7

In testimony whereof, I have hereunto set my hand. 7

HENRY D. STALEY. 

